Windows 10 refuses to install

Nearly at the end of my tether!
I've been trying to upgrade from Windows 7 to Windows 10 on my desktop PC for several months without success. Installation gets to 71% complete, then tells me "installation failed - error code 080070005. I have followed Microsoft advice in KB 968003 (SubInACL tool) but still get the same result on trying to upgrade again.
I have done the following each time try to upgrade:

Create a fresh drive image before making system changes, in case you need to start over!

"The problem is not the problem. The problem is your attitude about the problem. Savvy?"—Captain Jack Sparrow "When you're troubleshooting, start with the simple and proceed to the complex."—M.O. Johns "Experience is what you get when you're looking for something else."—Sir Thomas Robert Deware. Unleash Windows

Not sure that posts #4 and #5 are relevant to my problem - or am I missing something?!

The error code you report is one which indicates a permissions issue — Access denied. Running without a password, even as an Administrator, can trigger "Access denied" errors when a process involves registry editing and replacing system files.

That situation can also make the remedies for "Access denied" impotent for the same reason that the original "Access denied" has occurred.

"Are you running without a without a password?" is relevant because it is an attempt to help troubleshoot your problem with the upgrade.

Originally Posted by bobmarketer

Can anyone out there help?

A simple "Yes" or "No" can move us forward in trying to resolve your issue. And resolving your issue is what we are trying to do in asking questions about your setup.

Last edited by bbearren; 2016-07-24 at 09:19.

Create a fresh drive image before making system changes, in case you need to start over!

"The problem is not the problem. The problem is your attitude about the problem. Savvy?"—Captain Jack Sparrow "When you're troubleshooting, start with the simple and proceed to the complex."—M.O. Johns "Experience is what you get when you're looking for something else."—Sir Thomas Robert Deware. Unleash Windows

Thanks for that clarification bbearren - apologies for my lack of understanding!
I now see that "Error code 05" refers to the last two digits of the code received.
My current Windows 7 setup runs without a password.
In answer to Sudo15, all important updates have been installed. Event viewer does not appear to give me any further information - just a repeat of the error message:
"Installation Failure: Windows failed to install the following update with error 0x80070005: Upgrade to Windows 10 Home, version 1511, 10586."
Although I now also notice an earlier attempt at installation gave the following message:
"Installation Failure: Windows failed to install the following update with error 0x80070490: Upgrade to Windows 10 Home, version 1511, 10586."
Hope that helps rather than confuse the issue further.

Create a new Administrator's level user account and set it up with a password. Try the upgrade logged into that account.

Create a fresh drive image before making system changes, in case you need to start over!

"The problem is not the problem. The problem is your attitude about the problem. Savvy?"—Captain Jack Sparrow "When you're troubleshooting, start with the simple and proceed to the complex."—M.O. Johns "Experience is what you get when you're looking for something else."—Sir Thomas Robert Deware. Unleash Windows

It will take a while for it to run, just let it run to completion. Note what is displayed after it finishes.

Create a fresh drive image before making system changes, in case you need to start over!

"The problem is not the problem. The problem is your attitude about the problem. Savvy?"—Captain Jack Sparrow "When you're troubleshooting, start with the simple and proceed to the complex."—M.O. Johns "Experience is what you get when you're looking for something else."—Sir Thomas Robert Deware. Unleash Windows

Can you show us a Disk Management screenshot of the exact partitioning layout of the SSD, with full Attributes (System, Boot, Page File, Active, Crash dump, Primary partition, Recovery partition, etc.) shown?

For what it's worth, you might try what I found to work today. I had a similar situation with a different error message. After a week of trying everything I could find on Google, I did a repair install of my Win 7 installation, after which the upgrade went smoothly. Whatever problems I was having with my system were fixed by the repair. It's simple to do, although it did take 3 hours to complete.